Re: After brexit
In all seriousness, I still think in feet and inches when measuring or estimating length. I find feet and inches much easier to visualise.
However, if I want to measure accurately, certainly in small dimensions, I use millimetres. Traditional imperial measurements of fractions of an inch are quite confusing. Halves and quarters are manageable, but when we get down to 16ths and 32nds, millimetres show their true worth.
Incidentally, we should accept that 'imperial' measures are nothing to do with the British Empire, but were created by the Romans although, of course, their words (cubits, for example) were replaced by those we use now.